한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제56권10호
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  • Pages.603-617
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  • 2023
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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OpenFOAM을 활용한 포말대 이중 댐-붕괴 수치모형실험

Numerical investigation of swash-swash interaction driven by double dam-break using OpenFOAM

  • 옥주희 (부경대학교 토목공학과) ;
  • 김열우 (부경대학교 토목공학과) ;
  • Ok, Juhee (Department of Civil Engineering, Pukyong National University) ;
  • Kim, Yeulwoo (Department of Civil Engineering, Pukyong National University) ;
  • Marie-Pierre C. Delislec (Woods Hole Oceanographic Institution)
  • 투고 : 2023.08.31
  • 심사 : 2023.09.19
  • 발행 : 2023.10.31
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초록

본 연구는 포말대 흐름의 난류특성에 대한 이해를 목표로 한다. 포말대 흐름을 재현하기 위해 이중 댐-붕괴 파랑생성법이 제시되었다. 기존 단일 댐-붕괴 실험과 비교하여 이중 댐-붕괴 실험은 두 개의 수문의 개방 시간을 조절하여 처오름과 처내림의 다양한 상호작용을 구현할 수 있다. 수치모형으로는 OpenFOAM의 overInterDyMFoam이 활용되었다. overInterDyMFoam은 밀도가 다른 두 유체(i.e., 공기, 물)의 경계면 추적기법과 동격자 및 중첩 격자 기법을 결합한 모형이다. 질량보존 및 운동량 방정식으로는 𝜅-𝜖 난류모형이 결합된 이차원 Reynolds-Averaged Navier-Stokes 모형이 채택되었다. 수치모형실험 결과는 수리모형실험의 수심 및 흐름 방향 유속 시계열과 비교하여 정확도가 검증되었다. 난류 운동 에너지 분포특성을 확인하여 각 흐름 단계(i.e., 처오름, 처내림, 흐름의 상호작용)의 난류 진화 특성을 고찰하였다.

This study aims to provide a better understanding of the turbulent flow characteristics in swash zone. A double dam-break method is employed to generate the swash zone flow. Comparing with the conventional single dam-break method, a delay between two gate opening can be controlled to reproduce various interactions between uprush and backwash. For numerical simulations, overInterDyMFoam based on OpenFOAM is adopted. Using overInterDyMFoam, interface between two immiscible fluids having different densities (i.e., air and water phases) can be tracked in a moving mesh with multiple layers. Two-dimensional Reynolds-Averaged Navier-Stokes equations are solved with a standard 𝜅-𝜖 turbulence model for momentum and continuity. Numerical model results are validated with laboratory experiment data for the time series of water depth and streamwise velocity. Turbulent kinetic energy distribution is further investigated to identify the turbulence evolution for each flow regime (i.e., uprush, backwash, and swash-swash interaction).

키워드

과제정보

본 연구는 한국해양과학기술원 기관목적사업 "해양에너지지 및 항만·해양구조물 고도화 기술개발(PEA0131)" 과제, 2021년도 정부(교육부) 재원 한국연구재단 기초연구사업(NRF-2021R1F1A 1062223), 2021학년도 부경대학교의 지원(CD20210991)을 받아 수행되었습니다.

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